kafka-topics.sh --zookeeper hadoop121:2181 --create --replication-factor 2 --partitions 3 --topic GMALL_STARTUP
kafka-topics.sh --zookeeper hadoop121:2181 --create --replication-factor 2 --partitions 3 --topic GMALL_EVENT
kafka-topics.sh --zookeeper hadoop121:2181 --create --replication-factor 2 --partitions 3 --topic GMALL_ORDER
